var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');

var session = require('express-session')({
  secret: "secret cat",
  cookie: {
    maxAge: 1000 * 60 * 20
  }
});

var sharedSession = require('express-socket.io-session')(session);

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');

var app = express();

// app ~ server ~ io 进行关联
var server = require('http').Server(app); // 通过Http库的Server的工厂方法
// /**
//  * Create HTTP server.
//  */

// var server = http.createServer(app); actually it is the same thing!
// 所以 程序运行时就不依赖www运行了 删除 module.exports = app
var io = require('socket.io')(server);
io.use(sharedSession);

io.on("connection", function(socket) { // socket并不是唯一的 可能会多次调用！
  console.log('有人窍门');
  socket.on('say', function(data) {
    console.log(data);
    // data is like {username: "chao", message: "hi~"}
    if (!socket.handshake.session.user) {
      socket.emit('alert', "login first");
      return;
    }
    io.emit('newsay', {name: data.username, msg: data.message, date: new Date()});
  });
});

server.listen(3000);

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(session);

app.use(express.static(path.join(__dirname, 'public')));

app.use('/', indexRouter);
app.use('/users', usersRouter);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;
